Answer: Archaea, (domain Archaea), any of a group of single-celled prokaryotic organisms (that is, organisms whose cells lack a defined nucleus) that have distinct molecular characteristics separating them from bacteria (the other, more prominent group of prokaryotes) as well as from eukaryotes (organisms, including plants and animals, whose cells contain a defined nucleus).
Answer:
There were multiple transitions from water to land.
Explanation:
Protostomes are species whose mouth develops near the blastopore such as mollusks, annelids, and arthropods. Protostomes originated alongside deuterostomes and xenacoelomorphs. Deuterostomes anus forms near the blastopore and mouth form at the other end. These distinct adaptation patterns were observed in living taxas and are believed to evolve in the gaps of phylogenetic pattern during the transition from water to land.
In metazoans phylogeny, such gaps are frequent in protostomes and deuterostomes. The differences in the embryonic development depicts changes induces through transition.
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Index fossils (also known as guide
fossils, indicator fossils or zone
fossils) are fossils used to define
and identify geologic periods (or
faunal stages).
Sedementary rock. Because it sits over time and gets pushed underground to form sedementary rock.
<span>(3) widespread use of pesticides</span>
